How big was the hail on August 17, 2023?

The maximum estimated stone size anywhere in the country that day was 1.00 inches, over Fort Lauderdale, FL. Sizes vary street to street inside a single swath, so a city's figure is the largest radar estimated anywhere within about 5 miles of it.

Where does this hail data come from?

NOAA radar, ingested directly from the public NOAA archive. The estimated stone size runs about a quarter of an inch against ground truth, which makes it good for deciding where to look and not a substitute for an inspection.

Does this mean roofs were damaged?

Radar measures stone size, not damage. Whether a particular roof was damaged depends on stone size, wind direction, roof age and material — only an inspection settles it. These figures tell you where it is worth looking.

How do I see the actual swath on a map?

A HailMate plan puts a whole state on a real interactive map, with this swath and three years of others already on it. From $79/mo, and the canvassing tools come with it.

United States · August 17, 2023

Hail map — August 17, 2023

Name: US hail map — August 17, 2023
Creator: HailMate

NOAA radar detected hail of an inch or more over 26 cities across 4 states on August 17, 2023. The largest stones — 1.00″, quarter size — fell over Fort Lauderdale, FL.

Hail swath map for Fort Lauderdale, FL on August 17, 2023 showing 1.00 inch hail. — Largest rendered swath of the day: Fort Lauderdale, FL — 1.00″ hail. Each city below has its own map for this storm.

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The August 17, 2023 swath — and every other storm since 2023 across your state
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States hit: 4
Cities hit: 26
Largest stone: 1.00″; quarter size
Impact rating: 3/10; from stone size

Sizes come from NOAA radar, which runs about ±0.25″ against ground truth. It is canvass-targeting quality, not claim evidence.

Homeowners

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This page covers your area as a whole. Check your own address to see every storm on record for your roof — the date and the stone size for each one — and we'll email you the full report to keep.

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Free, and no account needed to look it up. If hail did hit, you'll have the date and the stone size in writing — which is the first thing an adjuster asks for.

States hit on August 17, 2023

Every state where NOAA radar put an inch or more of hail over a city that day, biggest stone first.

Florida19 cities · 1.00″Utah3 cities · 1.00″Arizona2 cities · 1.00″Wisconsin2 cities · 1.00″

Hardest hit on August 17, 2023

Showing the 24 largest of 26 cities hit. The rest are under their state above.

What people on the ground measured in the US on August 17, 2023

15 reports filed with the National Weather Service — 4 from trained observers or officials. These are measured stones, not radar estimates, so they are the closest thing to proof that hail actually reached the ground.

1.75″ golf ball size Broadcast Media
Aledo, IL6:06 AM CDTMercer County
1.75″ golf ball size CO-OP Observer
1 NNE Geneseo, IL6:34 AM CDTHenry County
Golfball sized hail.
1.50″ half dollar size Broadcast Media
New Philadelphia, IL7:31 AM CDTMcDonough County
quarter to ping pong, time estimated from radar.
1.25″ half dollar size Broadcast Media
Aledo, IL6:07 AM CDTMercer County
Mix of quarter to half dollar size hail falling, report relayed from broadcast media.
1.25″ half dollar size Public
2 SSE Osborn, IL6:30 AM CDTHenry County
1.25″ half dollar size Public
La Fontaine, IN6:30 PM EDTWabash County
1.25″ half dollar size Trained Spotter
2 N Arcana, IN6:45 PM EDTGrant County
1.00″ quarter size Broadcast Media
South Beloit, IL5:26 AM CDTWinnebago County
Time estimated by radar.
1.00″ quarter size Broadcast Media
4 N Geneseo, IL6:34 AM CDTHenry County
1.00″ quarter size Public
1 SE Smithfield, IL7:45 AM CDTFulton County
Relayed via social media.
1.00″ quarter size Trained Spotter
2 W West Palm Beach, FL4:20 PM EDTPalm Beach County
Trained Spotter reported quarter-size hail for a duration of 5-10 minutes at the intersection of village blvd and palm beach lakes blvd at 4:20pm as a severe thunderstorm moved through the area.
1.00″ quarter size Trained Spotter
2 SE Goblesville, IN6:03 PM EDTHuntington County
Spotter also reported 50 mph wind gusts.
0.75″ penny size Trained Spotter
3 ENE Burgess, IL6:14 AM CDTMercer County
lasted for about 2-3 min, time estimated from radar.
0.70″ penny size Broadcast Media
1 SSW East Moline, IL6:20 AM CDTRock Island County
0.70″ penny size Broadcast Media
Moline, IL6:21 AM CDTRock Island County

Showing the 15 largest of 17 hail reports filed that day.

Reports come from the National Weather Service Local Storm Report feed, ingested every 15 minutes. A report records where the observer was, not the full extent of the swath — treat it as evidence about the storm, not about any one roof.

Other hail days

September 30, 20261 city · 2.00″September 28, 20261 city · 1.00″September 27, 20264 cities · 1.00″September 26, 20261 city · 1.00″September 25, 20263 cities · 1.00″September 23, 20262 cities · 1.00″September 22, 202617 cities · 1.00″September 21, 202665 cities · 2.00″September 20, 20268 cities · 1.50″September 19, 202637 cities · 1.50″September 18, 202623 cities · 2.00″September 17, 202619 cities · 1.50″

Every state with hail on record →

FAQ

US hail on August 17, 2023

NOAA radar put hail of an inch or more over 26 cities across 4 states on August 17, 2023. The largest stones — 1.00 inches, quarter size — were over Fort Lauderdale, FL. Every state hit is listed on this page, and every city under it.

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